Grinding attachment for sewing-machines.



W. COX & P. R. PETERSON.

GRINDING ATTACHMENT FOR SEWING MACHINES.

APPLICATION TILED 1120.11, 1907.

926,471 Patented June 29, 1909 UNITED STATES PATENT @FFFLCE.

WALTER COX AND PETER R. PETERSON, 01* PROVO, UTAH.

GRINDING ATTACHMENT FOR SEWING-MACHINES.

To all whom it may concern:

Be it known that we, WALTER COX and PETER. R. PETERSON, citizens of the United States, residing at Provo city, county of Utah, and State of Utah, have invented certain new and useful Improvements in Grinding Attachments for Se\ving\Iacl1ines, of which the following is a specification.

Our invention relates to grinding attachments for sewing machines.

It has heretofore been proposed to provide a grinding attachment to be secured to a sewing machine frame and operated by the belt thereof and the present invention relates to that class of devices and has for its object the provision of novel means for attaching the device to the holes or openings in the sewing machine table through which the belt runs, whereby the attachment is rendered adaptable to any sewing machine; another object being to mount the rotary grinding wheel in a novel fashion.

Having the foregoing objects in view, the invention is fully set forth hereinafter and its novel features are recited in the appended claims.

In the accompanying drawings :Figure 1 is an end view of a sewing machine equipped with the invention; Fig. 2, a front elevation of the device with certain parts thereof and the sewing machine table in section; Fig. 3, a longitudinal section through the device and sewing machine table; and Figs. 4 and 5, details of the hooks.

The bed 1 of the sewing machine is provided with the usual openings 2 for the belt 3. The openings 2 are of different shapes and distances apart in different makes of sewing machines and our present invention is designed for adaptation to the openings 2 in any sewing machine.

The frame of the device is composed of a metal bed 4, ends 5, and a rest 6, also, a tubular part 7 having a slot 8 and a closed end 9, all of said parts being by preference in a single piece. They may be formed as a casting or from a single piece of sufficiently rigid sheet metal.

The grinding wheel 10 is of emery, corundum or other suitable material, being molded upon a metal shaft or cylinder 11, which is Specification of Letters Patent.

Application filed December 11, 1907.

Patented June 29, 1909.

Serial No. 106,011.

provided with a pulley 12 to engage the belt 3. In opposite ends of the cylinder 11 are conical concavities 13, which receive the tips 14 of pivot screws 15, which are threaded through the ends 5. This affords a secure bearing for the cylinder and grinding wheel and minimizes friction, besides permitting easy separation of the parts when desired and facility for taking up wear.

The numeral 16 designates a wire hook to engage the opening 2, which is at the front of the machine, the hook being provided with an elongated loop 17 through which passes a clamping screw 18, which is threaded into the side of the casing 7 and by which the device is adjustably secured to the front hole 2. Slidable freely through the end 9 is the shank 19 of a hook 20, the latter being adapted to engage the rear hole 2, said shank being provided at its inner end with a head 21, while surrounding the shank and located within the casing 7 is a coil spring 22, which by acting upon the end 9 and the head 21, tends to draw the shank 19 into the casing. A bent part of the end 21 lies in the slot 8 and slides therein, thereby preventing turning of hook 20.

The invention affords a convenient means for sharpening needles, scissors, knives, etc., and by the provision of the attaching devices it may be readily attached to or removed from the machine or left upon the machine but withdrawn from engagement with the belt. Owing to the adjustability of the hooks, the device is attachable to any sewing machine, regardless of the distance between the bolt holes or openings thereof.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent, is

1. Means for securing grinding attachments to sewing machines comprising a frame, a spring-actuatcd member carried by said frame having means adapted to engage one of the belt holes of the sewing machine, and another attaching member adapted to engage the other belt hole of the sewing machine and having an adjustable connection with said frame.

2. Means for securing grinding attachments to sewing machines, comprising a In testimony whereof, We hereunto affix Our slgnatures 111 presence of two Witnesses. 10

WALTER COX. PETER R. PETERSON.

WVitnesses:

ALFRED L. BOOTH, HARVEY CLYFFE. 

